Tune-up a cat 3406e every what miles

Well dave...i just had this done to my 3406e,around two weeks ago. it has three hunderd thow on the inframe....long over do.My wrench told me...i think he said every one to one fifty.I forgot what that purrrring cat sounded like

 

I always heard 100k so that's what I do with any motor I've had.

 

per cat, if you buy it new, run the overhead at 60,000 then every 100,000 after. I always recommended 100,000-150,000.

 

On a new Cat they call for the set, and the dipstick calibration to be done at the first oil change. The next one at every 100,000 Miles Check the charge air cooler at every tune up and be sure to have a set done before the warrenty runs out.

 

All depends on what HP you are running and most of all how hard the truck works... 1 trailer 2, or 3, and how much weigh on its back.
STd you could run 100k 150k
850hp would warrant every 50k~60k
If its factory Turbo and high exhaust temps then more often.

The inlet valves are the ones to watch. and they creep depending on what Intake Valve inserts are in the heads and what HP. So many variables to consider so each to their own I guess.
When I do them I record the clearances prior to adjusting them and then i trend those to see which valves are creeping and how much over what mileage, times the HP.

 

There is something else to consider also.........I was working on a firetruck last week, it only had 36,000 miles on it, but had 3978 hours on the engine. The firetruck tech working on the trucks hydraulic system asked me how often the overhead should be done. The overhead had never been done on this truck.............I told him that it was well past overdue. It should have been done within the first 1000 hours and then every 4000 hours afterwards.

 

What I have seen done when working on units that do a lot of pumping and idling is figure the hours at 50 MPH and change the oil and maintenance items to that mileage. using that method the mileage on the fire truck would be 198,900 miles. Just a thought!

 

Where this is located on average when you divide the hours into the miles the mph average is 35 mph. In working a truck in this area for 15 years that 35 mph average has stayed constant and I used this to give him the hourly numbers that I felt should be used for maintenance.